I would not put this by for MS to do again, switch on their DRM and all the disc's you have will then require that mandatory install to the HDD to run, just as they intented to do from the beginning, all that promised DRM is still there built into the machine, it's just sitting dormant.

Unless Microsoft is willing to pay vastly inflated manufacturing costs, there won't be anything unique on the disc to identify it. It would have to be some sort of included one-use-code in the box. And why would they pay to print those if they're not scheduled to be used?